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Appendix VL

1023

by change wheels L ; and the feed shaft j is driven
gear K in either direction at will. The driving cone c,
- gear, rotates the tool shaft Q through mitre gear T,
haft, spur gear D, and shaft E; and a vertical feed is
L*ied when required through the screw p and change
U. The saddle R carries the milling head, and moves

FAQ. 933.

vertical slide s. The universal head consists of two
id &, the former of which can be rotated round a
axis to any suitable position, and be there fixed by
* part b may similarly be rotated, but on an axis
4.5° to that of a, and in consequence the tool axis b u
,eed in any position whatsoever. To drive the tool